Because static electricity build up in our homes because we have the heaters on which suck moisture out of the air.
Answer:
A). 1.9 cm
Explanation:
m = Mass of brick = 12 kg
g = Acceleration due to gravity = 9.81 m/s²
r = Radius of hose
A = Area = 
F = Force = 
Let us assume that the pressure required to lift the brick would be atmospheric pressure

The radius of the hose should be 1.9 cm
Da ne ajuta pentru a putea citi corect lungimea ... coronită???